Recent Topics
my Buick 03 lesabre has a flashing radio light?
by snake123
10 minutes 38 seconds ago
5000 miles in the Caprice
by ls1mike
35 minutes 12 seconds ago
Copper Reactivity and BMW Blue Coolant
by TXCarGeek
Today at 09:24 PM
lubegard biotech xle
by mobilaltima
Today at 09:05 PM
Schaeffer 5w-40 in Jeep 4.0
by JeepWJ19
Today at 08:53 PM
PP and PU 45% off this wk at CT !!!
by ST2008
Today at 08:49 PM
Photographic evidence of HDEO / synth oil cleaning
by OldEuroCarLover
Today at 08:35 PM
Limited Slip Additive needed for G80?
by Nick1994
Today at 08:28 PM
4-5k will it even matter?
by Camprunner
Today at 08:19 PM
Purolator BOSS
by kenpoed
Today at 08:04 PM
Neither Key Fob Works!
by bobbob
Today at 07:59 PM
How long can I go?
by kenpoed
Today at 07:53 PM
Newest Members
JoeI, binarycache, MarkieB, albertson, Chevy538487
58973 Registered Users
Who's Online
69 registered (01rangerxl, 4WD, AIRJAC3, AirgunSavant, asiancivicmaniac, 2015_PSD, 6 invisible), 1464 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
58973 Members
66 Forums
253837 Topics
4167693 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#2835370 - 12/14/12 09:14 PM 1985 BMW 318i with M42 engine swap - oil suggest?
irish44j Offline


Registered: 09/26/06
Posts: 18
Loc: Burke, VA
I just swapped an M42 engine (from a later 318is) into my old 318i (used to have an M10).

Engine has been heavily refreshed but didn't rebuild, and using original pistons/valves, etc.

Mileage unknown, but compression is within factory spec.

Car is used primarily for rallycross from March to November, but also driven to events (about 70 miles highway) and driven on weekends for fun. I drive it hard. Almost always. This car isn't for leisurely cruising smile

I'm near Washington DC, but car is driven in the hot summer and cold winter here and there. Don't mind using different viscosities/oil seasonally though....

For my WRX I use Rotella T5 and/or T6 (depending on what's on sale), which I can get at wally-world of course.

Any suggestions on the best oil for the M42 in the BMW?

Top
#2835403 - 12/14/12 10:15 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
Seventh Offline


Registered: 11/11/12
Posts: 50
Loc: NorCal
Do you have an oil pressure gauge?

I ask because I've seen a few <200k mi M42/44 engines that would get some oil light flickering action in hot weather traffic while running a 30wt oil. I've also seen them go 300k mi on a strict diet of 20w-50 conventional... but sounding like a diesel.

Considering how you drive the car, I'd be inclined to recommend just using the T6 for simplicity's sake since you're already using it. Watch consumption and pressure if you can, and do a UOA or two to see if things look ok. I can't imagine they won't.
_________________________
'11 WRX E85 convert-31k-Eneos 5w40
'95 325i-commuter-176k-Caterham twist-UOA in 9k
'96 332ti-133k-DELO 5w40
'69 GTO 428ci-DELO 15w40
'58 F100 331ci-T5

Top
#2835415 - 12/14/12 10:33 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
JHZR2 Offline



Registered: 12/14/02
Posts: 38405
Loc: New Jersey
Rotella 5w40 is a great choice and Ive used it for years in my M42 in my 1991.

M1 HM 10w-40 is also a robust ACEA A3 oil that you might consider.

Top
#2835441 - 12/14/12 11:09 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: JHZR2]
irish44j Offline


Registered: 09/26/06
Posts: 18
Loc: Burke, VA
Thanks. Seventh - it will have an oil pressure gauge once I'm done with this swap and actually driving the car again.

Since I don't put many miles on the car so my OCI is pretty long, sounds like T6 will be the way to go, else t5. Thanks.

Top
#2835447 - 12/14/12 11:21 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
JHZR2 Offline



Registered: 12/14/02
Posts: 38405
Loc: New Jersey
I wouldnt run T5 in it. IMO 30wt is a bit too light for the engine.

There was a time when MB for example would spec the HD or more robust version of the oils and only allow the lighter variant for really low temperatures, when the oils were low viscosity (like a 30wt).

In older manuals, 30wt is only allowable at really cold temps, in newer ones, 30wt was allowed only at really low temperatures, unless it was what is now the precusror to ACEA A3.

So if the HTHS of T5 is high enough to qualify for ACEA A3, you might consider using it... But Im not sure it would meet this.

Your selection aligns to this:



SPecial oils are in my interpretation, wider viscosity synthetics, but the basic premise of 40 or 50wt still stands.

Top
#2835465 - 12/15/12 12:44 AM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
dparm Offline


Registered: 04/19/10
Posts: 13031
Loc: Chicago, IL
I would run any quality 5w40 and call it a day. T6 is a good value oil, as are pretty much any of the other 5w40 HDEOs.
_________________________
2011 BMW M3 sedan ZCP

Top
#2835574 - 12/15/12 07:27 AM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
fdcg27 Offline


Registered: 09/25/09
Posts: 12240
Loc: OH
Mine seems to do very well with Maxlife 10W-40.
Either the green or the red bottle would be appropriate.
I had a very good UOA using Maxlife Nextgen 10W-40 for 4K last summer.
_________________________
12 Accord LX 53K HGMO 0W-20
09 Forester 67K PU 5W-30
02 Accord 144K GOil 5W-30
01 Focus ZX3 112K M1 5W-20
95 BMW 318iC 159K Delvac 15W-40

Top
#2835698 - 12/15/12 10:27 AM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
KCJeep Offline


Registered: 06/30/11
Posts: 6414
Loc: Mahzurrah!
The Rotella 30 wts have an HTHS of 3.5, on the thick side for 30's and right at the level recommended for many German cars, but I wouldn't run a generic PCMO 30 in it the HTHS would be 3.0-3.1 for most of them.
_________________________
2004 Jeep Grand 4.0 @ 133k Pennzoil HM 10w30 w/ 1 qt 10w40
Fram PH8A
KIA Sedona 63k, Ford Focus 116k, Chrysler Sebring 186k, Chrysler Concorde 120k

Top
#2835734 - 12/15/12 11:12 AM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: KCJeep]
Seventh Offline


Registered: 11/11/12
Posts: 50
Loc: NorCal
Originally Posted By: KCJeep
The Rotella 30 wts have an HTHS of 3.5, on the thick side for 30's and right at the level recommended for many German cars, but I wouldn't run a generic PCMO 30 in it the HTHS would be 3.0-3.1 for most of them.


T5 is a great oil, and I completely agree with this statement, however the oil light flickering I spoke about was on M42/44 cars running the BMW synthetic, which is also 3.5 HTHS.

He will be better informed with pressure and temp gauges, but I still wouldn't run any 30wt oil in that car during warmer months if it's getting thrashed like the he suggests. $.02
_________________________
'11 WRX E85 convert-31k-Eneos 5w40
'95 325i-commuter-176k-Caterham twist-UOA in 9k
'96 332ti-133k-DELO 5w40
'69 GTO 428ci-DELO 15w40
'58 F100 331ci-T5

Top
#2835916 - 12/15/12 02:36 PM Re: 1985 BMW 318i with M42 engine swap - oil suggest? [Re: irish44j]
OVERKILL Offline


Registered: 04/28/08
Posts: 32180
Loc: Ontario, Canada
M1 0w40 or D1 5w40 would be good choices as well here.
_________________________
02 Expedition
06 Charger R/T
14 Charger SRT-8

Top